Impact factor calculation of railway concrete-filled steel tubular tied-arch bridges based on vehicle-bridge coupling vibration analysis

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (6) : 115-120.

LIN Pengzhen1，WANG Yapeng2

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Abstract

To reasonably calculate the impact factor of concrete-filled-steel-tubular (CFST) tied arch bridges subject to train running load, a train-bridge dynamic model considering soil-pier interaction was established based on the vehicle-bridge coupled dynamics.Taking a certain 136 m-long CFST tied arch bridge for the high-speed railway as an instance, the impact factors of tie beams, hanger rods and arch ribs under different working conditions, were investigated by using the hypothesis testing method of probability statistics.The results show that the impact factors of different components are different.The impact factor of arch rib is the largest, while that of hanger rod is the smallest.The distribution of impact factors follows the type of Extreme Value I.Under the 95% assurance rate, the impact coefficients of tie beam, hanger rod and arch rib are about 1.05, 1.04 and 1.08, respectively, which are higher than those in existing China codes.In the design of long-span high-speed railway tied arch bridges, it is necessary to raise the impact coefficient to ensure the safety of the bridge.

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tied-arch bridge / impact factor / concrete filled-steel tubular(CFST) / vehicle-bridge coupling / numerical simulation

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LIN Pengzhen1，WANG Yapeng2. Impact factor calculation of railway concrete-filled steel tubular tied-arch bridges based on vehicle-bridge coupling vibration analysis[J]. Journal of Vibration and Shock, 2021, 40(6): 115-120

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